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SEALS USA, Inc.

Instruments Division

Tel: (630)924-7138      Email: [email protected]

The ST-5100 is a portable, light-weight stroboscope with trigger 

light activation that utilizes 21 super bright CREE High Powered 

LED lamps. The ST-5100’s LED array provides a bright, stable 

strobe light over a wide measurement range with a lifetime far 

exceeding xenon-lit stroboscopes. Unique to the ST-5100 is an 

auto-speed detection laser that translates speed sensed direct-

ly over to the flash rate of the LED’s simplifying operation. Con-

taining a rechargeable lithium battery, a single charge is able to 

last up to a full 5 hours of operation. The ST-5100 is designed for 

speed and frequency measurements in motion and vibration anal-

ysis applications. It is ideal for predictive and preventive mainte-

nance applications such as: motors, shafts, roto-gravure printing, 

extruders, blow molding, wire lettering and striping, engraving, 

pulse jets, water jets, fans, cams, gear teeth, belt inspections, 

fuel injectors, vibration analysis, audio speaker analysis, spindle 

spinning, cutting blade timing and sharpness, plus many more in 

the printing, packaging, textile, automotive, cable, mining, steel, 

chemical, optical, medical and shipbuilding industries.

ST-5100 LED Stroboscope

Operation Manual

Use in flammable environments is prohibited. Use in this manner may

result in fire or explosive.

Do not look directly into the LED light Source. This may result in eye 

injury.

Do not use or store in the following environments. Direct sunshine 

condensation, dust or caustic.

Do not alter, or modify of improperly. Such action may cause damage

and void warranty.

Operate within 0-35°C (32-95°F), 35-85% RH. Use outside of this range

may alter operation of the unit.

Case may become excessively hot when used continuously for more

than 2 hours.

Laser radiation may be harmful to the human eye. Avoid direct exposure 

of human eyes to laser light. Eye damage can result.

• Never point the unit at another person.

• Keep out of the reach of children.

• Avoid indirect exposure via reflective materials such as glass and   

   mirrors.

SPECIFICATIONS

Flash Rate Range: 30 to 120,000 FPM ; 0.5-2000 Hz

Accuracy: 0.01% ±1 digit of F.S. @ 77° F (25°C)

Lux Rating (Approx.): 6000 FPM & 85 Brightness: Distance 8˝ 

(20 cm) 9500 lx with 7˝ (178 mm) irradiation dia., Distance 20˝ 

(50 cm) 2275 lx with 11˝ (279 mm) irradiation dia. 1500 FPM & 

85 Brightness: Distance 8˝ (20 cm) 4250 lx with 7˝ (178 mm) 

irradiation dia., Distance 20˝ (50 cm) 1375 lx with 11˝ (279 mm) 

irradiation dia

Lamp Lifetime: Approximately 3~5 years depending on usage.

Display: Backlit LCD

Resolution: 30-120,000 = 0.1 FPM; 0.5~2000 HZ = 0.1 Hz

Flash Duration: 0.1°- 2.5° = 1-100 on display

Power Requirement: 100-240 VAC 50/60Hz

Battery: Lithium DC 12.6V 2600 mAh

Battery Life: Approx. 5 hours depending on settings

External Sensor Input: 12 V Pulse

Sensor Power Supply: 12 V dc up to 200 mA

Input Pulse Width: Over 50 μs

Temperature Limits: 32-95°F (0-35°C) 

Humidity Limits: 35 to 85% RH 

Enclosure: ABS

Product Weight: 0.62 lb (280 g)

Package Weight: 2.8 lb (1.3 kg)

Dimensions: 9 x 3.4 x 1.6” (228 x 86 x 40 mm)

Approvals: CE

Warranty: 1 year

Included Accessories:  AC power adapter, Carrying Case, 

Sensor Input Cable

Operation Panel

1. M: Enter the menu screen

2.  X: In Internal Mode, the flash rate is multiplied by 2. Make a 

long press to perform faster multiplication of the flash rate.    

Confirms selection in menus.  

3. ÷: In Internal Mode, the flash rate is multiplied by 2. Make a 

long press to perform faster multiplication of the flash rate.    

Back or return button selection in menus. 

4. +: In Internal Mode, increases the flash rate value by single dig-

its. Hold to increase speed. In menu screen, changes selection 

to the right.  

5. - : In Internal Mode, decreases the flash rate value by single 

digits. Hold to increase speed. In menu screen, changes se-

lection to the left.  

6. •: In Internal Mode, press to enable adjustment of the bright-

ness level setting.  Brgt in bottom right of display will blink in-

dicating it is active for adjustment. Press + or – to adjust up or 

down accordingly. Press again to exit out of brightness adjust-

ment.  

7.  Power Trigger Button: In Internal Mode, press once to activate 

or deactivate the light array. Press for 2 seconds to turn on or 

off the stroboscope.  

Power Trigger Button

on front of handle

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